Schloss Charlottenburg was built at the end of the 17th century (inaugurated in 1699) and greatly expanded during the 18th century. It was commissioned by Sophie Charlotte, the wife of Friedrich I, Elector of Brandenburg (and later King of Prussia), in what was then Lietzow village. Only after Sophie Charlotte died (in 1705) the name of the castle was changed from Lietzenburg to Charlottenburg in her remembrance.
It's a big palace, very baroque (even rococo) and it was badly damaged during the Second World War, but it got reconstructed in the end and the palace with its gardens is now a major tourist attraction. We did not feel like visiting the interior, but we had a long walk around the garden. Long enough for five posts on PhotoBlog :-)